Austenitic Stainless Steel Surface Segregation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Austenitic stainless steel products often exhibit processing cracks and poor surface properties when formed into complex shapes, such as sink bowls, leading to reduced production yield and increased costs due to necessary additional polishing processes.
Innovation Solution
An austenitic stainless steel product with specific composition ranges (0.005-0.15% C, 0.1-2.0% Si, 6.0-8.0% Ni, 16-18% Cr, 0.1-4.0% Cu, 0.005-0.2% N, and 0.01-0.2% Mo) and heat treatment processes (900-1150°C for 10 minutes or less, followed by cooling to 500°C within 30 minutes, to control surface segregation and martensite fraction, preventing cracks and surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If austenitic stainless steel is processed into complex shapes, then design versatility is improved, but processing cracks and surface defects occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters (C: 0.03-0.10%, Si: 0.70-1.50%, Mn: 1.50-3.00%, Ni: 5.00-8.00%, Cr: 16.00-18.00%, Cu: 0.50-4.00%, Mo: 0.05-0.30%) and processing parameters (heat treatment temperature, cooling rate) to transform the material properties, enabling complex shape processing without cracks or surface defects
2Ease of manufacture
If conventional stainless steel composition is used, then manufacturing cost is reduced, but processing cracks and surface deterioration occur
Solution Approach 1:
The patent modifies the compositional parameters within controlled ranges (e.g., Si: 0.70-1.50%, Mn: 1.50-3.00%, Ni: 5.00-8.00%) to achieve optimal surface quality and workability, balancing manufacturing cost with manufacturing precision through parameter optimization
3Manufacturing precision
If additional polishing process is applied, then surface properties are improved, but production time and cost increase
Solution Approach 1:
The patent implements preliminary action by controlling the compositional parameters and heat treatment process during manufacturing to pre-establish excellent surface properties and workability, eliminating the need for additional polishing processes and thereby maintaining high production efficiency
4Manufacturing precision
If heat treatment is performed to control surface segregation, then surface properties are improved, but processing time increases
Solution Approach 1:
The patent optimizes the heat treatment parameters (temperature range, holding time, cooling rate) to achieve effective surface segregation control within a reasonable time frame, balancing manufacturing precision with time efficiency through parameter optimization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents processing cracks and surface defects, enhancing the surface properties and workability of austenitic stainless steel products, even when processed into complex shapes, thereby improving production yield and reducing costs.
Implementation Method 1
heat treating the austenitic stainless steel product at a temperature of 900-1,150° C. for 10 minutes or less; and cooling the heat-treated austenitic stainless steel product to 500° C. within 30 minutes
Implementation Method 2
heat treating the austenitic stainless steel product at a temperature of 900-1,150° C. for 10 minutes or less; and cooling the heat-treated austenitic stainless steel product to 500° C. within 30 minutes
Implementation Method 3
cooling the heat-treated austenitic stainless steel product to 500° C. within 30 minutes
Data Source
AI summary
An austenitic stainless steel product having excellent surface characteristics and a manufacturing method therefor are disclosed. The disclosed austenitic stainless steel product comprises an austenitic stainless steel comprising, by weight percent, 0.005 to 0.15% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 6.0 to 8.0% of Ni, 16 to 18% of Cr, 0.1 to 4.0% of Cu, 0.005 to 0.2% of N, 0.01 to 0.2% of Mo, and the remainder comprising iron (Fe) and other unavoidable impurities, and a Ni surface negative segregation thereof defined by the following formula (1) is 0.6 to 0.9 and the martensite fraction thereof is 10 to 30%.(CNi-Min)/(CNi-Ave) formula (1)Here, CNi-min is the minimum concentration of Ni on the surface and CNi-Ave is the average concentration of Ni on the surface.